Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/26—Organic compounds containing oxygen
  • C11D7/261—Alcohols; Phenols
  • C11D7/262—Alcohols; Phenols fatty or with at least 8 carbon atoms in the alkyl or alkenyl chain
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/0031—Carpet, upholstery, fur or leather cleansers
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/16—Organic compounds
  • C11D3/20—Organic compounds containing oxygen
  • C11D3/22—Carbohydrates or derivatives thereof
  • C11D3/222—Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/20—Water-insoluble oxides
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/26—Organic compounds containing oxygen
  • C11D7/261—Alcohols; Phenols
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/22—Organic compounds
  • C11D7/26—Organic compounds containing oxygen
  • C11D7/268—Carbohydrates or derivatives thereof

Definitions

• This invention relates to a scatterable formulation for the dry cleaning of textiles, more especially carpets.
• colloidal silica is added in small quantities to powder-form carpet cleaning formulations.
• the cleaning formulations described in this U.S. patent are also unsatisfactory.
• the present invention relates to a scatterable dry cleaning formulation for textiles which contains cellulose powder, colloidal silicon dioxide and water.
• the formulation preferably contains small quantities of surfactant and/or rollable particles of a porous elastic material.
• the new cleaning formulation has an extremely high cleaning performance and is distinguished by an only very slight tendency of the correspondingly cleaned textiles towards resoiling.
• the tendency to accumulate residues in the event of repeated application to the same textile material is distinctly lower by comparison with conventional formulations.
• the unusually gentle effect on the textile materials during cleaning is particularly surprising.
• scatterable carpet cleaning formulations only achieve a good cleaning effect when, after scattering onto the carpet, they are worked in by either manual or machine brushing so that they come into contact with all soil-carrying fibers.
• the brushing-in of the cleaning powder imposes particular demands on the strength of the carpet fibers on account of the forces involved.
• the cellulose powders suitable for use in accordance with the invention are produced from commercial cellulose, which is generally obtained from parts of plants, more especially from wood, by size reduction using mechanical and/or chemical processes.
• Corresponding powders which are colorless and substantially free from lignin and other impurities emanating from the plant material, are commercially available in various degrees of fineness.
• the finer qualities with an average fiber length of 50 to 400 micrometers are preferred for the purposes of the present invention. In these qualities, the average fiber thickness is between 10 and 50 micrometers.
• the particle size of the cellulose powder may also be determined by screening techniques, for example by air jet screening in accordance with DIN 53734. Accordingly, cellulose powders with the following particle size distribution (as determined by the above-mentioned method) are also preferred:
• Cellulose powders produced from wood cellulose, more particularly from hardwood cellulose, are preferably used in the formulations according to the invention.
• a particularly preferred cellulose is beechwood cellulose.
• the percentage content of cellulose powder in the formulation according to the invention is preferably from 36 to 55% by weight and more preferably from 39 to 52% by weight, based on the final formulation.
• the formulations according to the invention contain colloidal silicon dioxide, also known as colloidal silica, as a second key active ingredient.
• This material is commercially available as a colloidal aqueous solution with various concentrations, the silica particles generally being stabilized in the solution by cationic or anionic surface charges.
• the solutions may contain other inorganic materials, more especially alkali and soluble salts. Examples of suitable commercial products are Ludox® and Syton®, both products of DuPont, and Levasil®, a product of Bayer AG.
• the solutions contain the silica in the form of generally spherical individual particles which are hydroxylated at their surface and of which the size in the majority of cases is between about 7 and about 50 nanometers.
• colloidal silica solutions dry on their own, solids with specific surfaces (BET method) of 100 to 300 m 2 /g are obtained according to particle size.
• the colloidal silicas are added to the cellulose powder and to the other constituents, preferably in the form of a colloidal solution. Colloidal silicas of which the individual particles are stabilized by anionic surface charges and which contain sodium ions in particular as counterions are particularly preferred.
• the quantity of colloidally dissolved silicon dioxide in the formulations according to the invention is preferably from 0.1 to 10% by weight and more preferably from 1.5 to 5% by weight, expressed as water-free active substance and based on the formulations according to the invention as a whole.
• the formulations according to the invention may also contain other powder-form adsorbents known per se for dry cleaning formulations should this be desirable for obtaining special additional effects.
• adsorbents are bentonite, kieselguhr, zeolite, starch and powdered foam plastics, for example ground polyurethane foam.
• Ground foam glass (perlite) has proved successful as an additional adsorbent and also acts as a bulking agent.
• the quantity in which these additional adsorbents are used is always selected so that the properties of the formulations are not adversely affected. Accordingly, their content in the formulations according to the invention is always below the content of cellulose powder, preferably amounting to less than 50% by weight and, more preferably, to less than 30% by weight, based on the content of cellulose powder.
• the formulations according to the invention contain water as sole impregnating liquid in addition to the adsorbents mentioned above.
• the quantity in which this liquid is used is gauged in such a way that it is still taken up by the solid constituents of the formulation, i.e. in particular by the cellulose powder, thus guaranteeing the scatterability of the formulation.
• the water content consisting of the water added during production and the water already present in the raw materials is preferably from 35 to 70% by weight and more preferably from 40 to 60% by weight.
• the impregnating liquid may contain other auxiliaries and additives which are advantageous, for example, for increasing the cleaning effect or for preserving the final formulation.
• the liquid may contain organic solvents. Suitable organic solvents are both water-miscible and water-immiscible solvents providing they do not attack the textiles and are sufficiently volatile to evaporate in the required time after application of the formulation to the textile.
• Suitable solvents are alcohols, ketones, glycol ethers and hydrocarbons, for example isopropanol, acetone, ethers of monoethylene and diethylene glycol and mono-, di- and tripropylene glycol with boiling points of at least 120° C., and gasolines with boiling points of 130° to 200° C. and also mixtures of these solvents.
• Monoalcohols containing 2 to 3 carbon atoms and mixtures thereof are preferably used.
• the percentage content of organic solvent is normally not more than 20% by weight and, more particularly, is from 2 to 10% by weight, based on the cleaning formulation as a whole.
• the formulations according to the invention may contain surfactants as cleaning-active additives, the surfactants emanating from the classes of anionic and nonionic surfactants. Although excellent surface cleaning is achieved without the addition of a surfactant, the removal of greasy stains can be further improved by the addition of surfactants. In general, a surfactant addition of up to 10% by weight is sufficient.
• the formulations preferably contain 0.05 to 5% by weight and, more preferably, 0.1 to 3% by weight, based on the total weight of the formulation, of surfactants. Of the large number of known surfactants, those substances which, together with the adsorbents and other non-volatile constituents, if any, present in the formulations, dry off to leave a solid brittle residue are particularly suitable.
• Suitable nonionic surfactants for the formulations according to the invention are, in particular, adducts of 1 to 30 moles and preferably 4 to 15 moles of ethylene oxide or mixtures of ethylene oxide and propylene oxide with 1 mole of a compound containing 10 to 20 carbon atoms from the group of alcohols, alkylphenols, carboxylic acids and carboxylic acid amides.
• the condensation products of reducing sugars and long-chain alcohols known as alkyl glycosides are also eminently suitable.
• the adducts of ethylene oxide with long-chain primary or secondary alcohols for example fatty alcohols or oxoalcohols, and the alkyl polyglucosides containing 1 to 3 glucose units per molecule and 8 to 18 carbon atoms in the alkyl group synthesized from glucose and fatty alcohols are particularly preferred.
• Suitable anionic surfactants are, in particular, those of the sulfate or sulfonate type, although other types, such as soaps, long-chain N-acyl sarcosinates, salts of long-chain sulfosuccinic acid esters or salts of ether carboxylic acids obtainable from long-chain alkyl or alkylphenyl polyglycol ethers and chloroacetic acid, may also be used.
• the anionic surfactants are preferably used in the form of the sodium salts, although the lithium salts may also afford advantages.
• Particularly suitable surfactants of the sulfate type are the sulfuric acid monoesters of long-chain primary alcohols of natural and synthetic origin containing 10 to 20 carbon atoms, i.e. fatty alcohols such as, for example, cocofatty alcohols, tallow fatty alcohols, oleyl alcohol or the C 10-20 oxoalcohols, and sulfuric acid monoesters of secondary alcohols with the same chain lengths.
• sulfuric acid monoesters of aliphatic primary alcohols, secondary alcohols or alkylphenols ethoxylated with 1 to 6 moles of ethylene oxide are also suitable.
• These surfactants are also known as ether sulfates. Sulfated fatty acid alkanolamides and sulfated fatty acid monoglycerides may also be used.
• the surfactants of the sulfonate type are, primarily, sulfosuccinic acid monoesters and diesters containing 6 to 22 carbon atoms in the alcohol components, alkyl benzene sulfonates containing C 9-5 alkyl groups and esters of ⁇ -sulfofatty acids, for example the ⁇ -sulfonated methyl or ethyl esters of hydrogenated coconut oil, palm kernel oil or tallow fatty acids.
• alkane sulfonates obtainable from C 12-18 alkanes by sulfochlorination or sulfoxidation and subsequent hydrolysis or neutralization or by bisulfite addition onto olefins and the olefin sulfonates, i.e. mixtures of alkene and hydroxyalkane sulfonates and also disulfonates obtained, for example, from long-chain monoolefins with a terminal or internal double bond by sulfonation with gaseous sulfur trioxide and subsequent alkaline or acidic hydrolysis of the sulfonation products.
• Particularly preferred surfactants are the olefin sulfonates which are preferably used in quantities of 0.1 to 1% by weight in the formulations and the fatty alcohol sulfates and fatty alcohol ether sulfates which are preferably used in quantities of 0.1 to 5% by weight.
• the formulations according to the present invention may also contain small quantities of other auxiliaries and additives typically encountered in textile and carpet cleaning compositions.
• auxiliaries and additives are antistatic components, optical brighteners, redeposition inhibitors, additives which improve scatterability and dispersibility, preservatives and perfume.
• antistatic components such as antistatic, optical brighteners, redeposition inhibitors, additives which improve scatterability and dispersibility, preservatives and perfume.
• Relatively large rollable particles of a porous elastic material, more particularly of a sponge material may be regarded as a particularly preferred auxiliary for the cleaning formulations according to the invention.
• These particles have a maximum length of about 1 to 50 mm and preferably of about 1 to 10 mm, their dimensions in the other two spatial directions which are perpendicular to one another and to this length making up at least 10% and, more particularly, at least 20% of this maximum length.
• These rollable particles may be regular or irregular in shape. A key requirement is that their shape should be such that the particles are able to roll under the brush swept over the carpet during incorporation of the carpet cleaning formulation.
• the particles may be spherical, cylindrical, ellipsoidal or ovoidal in shape although they may also assume irregular shapes as formed, for example, by agglomeration of relatively small particles into granules.
• more angular particles up to and including cubes and squares are also rollable and are suitable for the formulations according to the invention.
• the rollable particles may consist of various materials. However, rollable particles consisting predominantly or completely of viscose, natural sponge or open-cell plastic foam are particularly preferred.
• the rollable particles are preferably produced from relatively large pieces of material which are reduced to the required size by cutting up or grinding. Foamed material, nonwovens or woven fabrics are preferably used as the starting material. In one particularly preferred embodiment, the rollable particles consist of viscose sponge flakes.
• the rollable particles combine with fluff and fibers which have accumulated on the carpets and may then be readily removed with them from the surface of the carpet.
• the content of rollable particles in the formulations according to the invention can be relatively small because even a few particles are sufficient to obtain the required effect.
• the percentage content of rollable particles in the formulations is preferably about 0.1 to 10% by weight and more preferably 0.1 to 1% by weight, based on the formulation as a whole.
• the production of the formulations does not involve any problems so that simple, generally single-stage processes may be applied.
• the production process is normally carried out using simple mixers, such as blade or drum mixers, in which cellulose powder and any other solid components are initially introduced and then sprayed in motion with the liquids in which other components may optionally be dissolved.
• simple mixers such as blade or drum mixers
• the formulations can thus be produced in a very fine-particle form or even in more or less agglomerated form, although the composition always ensures that even the agglomerated forms readily disintegrate on the textiles without any need for significant mechanical work.
• flake-like agglomerates the flow properties of the formulation can be reduced to the extent of extremely slow-flowing products which are preferred for certain applications.
• the apparent density of the formulations may also be influenced to a certain extent in the production process by the choice of more or less compact agglomerates.
• the formulations normally have apparent densities of 200 to 350 g/l, with the result that comparatively large volumes are applied per unit area. This provides in particular for uniform distribution, particularly when the formulations are scattered onto carpets by hand.
• the textiles and carpets are cleaned by scattering the cleaning formulation according to the invention onto the textiles either by hand or by means of a suitable distributor and then rubbing the formulation more or less intensively into the textiles, for example by means of a sponge or a brush.
• the working-in times are between 0.5 and 2.5 minutes and preferably between 0.5 and 1.5 minutes per square meter.
• the textiles are left to dry off until the cleaning formulation, which combines with the soil, has changed into dry residues. These residues are then removed from the textiles mechanically, for example by brushing or vacuum cleaning.
• the formulation according to the invention is applied in quantities of 2 to 150 g/m 2 , depending on the fullness of the textiles and the degree of soiling, although larger quantities may also be locally applied to remove individual stains.
• the formulation is normally applied in quantities of 10 to 100 g/m 2 .
• the process as a whole may largely be carried out manually, for example in the home, although it is also possible to carry out the rubbing in of the formulation and, optionally, other steps by means of suitable machines, for example combined distributing and brushing machines, so that the process is equally suitable for use in the institutional sector.
• Cellulose powder, polyurethane flour and, optionally, viscose flakes were introduced into and premixed in a blade mixer.
• the water-based cleaning liquid was separately prepared from the other components without the colloidal silica in a mixing vessel. The liquid was then sprayed onto the absorbent in motion in the blade mixer before the silica solution was sprayed on. Slightly moist but free-flowing products were formed in every case.
• Arbocel®B 800 X a product of J. Rettenmaier & Sohne, was used as the cellulose powder in the following Examples. According to the manufacturer, this cellulose powder has an average fiber length of 200 ⁇ m for an average fiber thickness of 20 ⁇ m and the following particle size distribution (as determined by air jet screening):
• the colloidal silica used in the Examples was Ludox HS 40®, a product of Du Pont. This is a colloidal aqueous solution containing 40% by weight SiO 2 in which the silica particles are negatively charged and stabilized with sodium ions.
• the viscose flakes used are a product of Beli-Chemie GmbH and are marketed for use as absorbing flakes for taking up spilt liquids.
• the material has an apparent density of around 90 g/l.
• the carpet material used was a light grey polyamide uncut-pile carpet which had been cut into pieces measuring 122.5 ⁇ 79 cm and which was placed in a laboratory soiling drum containing 1500 g of steel balls and soiled for 30 minutes with 15 g of a test soil from the Waschereiutzs GmbH Krefeld (of which 85% by weight consisted of the sieved contents of a vacuum cleaner bag and 15% by weight of a standard mixture of kaolin, silica flour, iron oxide and soot). For the further tests, the piece of carpet was cut up into three equal pieces approximately 40 cm wide.
• the cleaning tests were carried out on areas of around 0.25 m 2 of the soiled pieces of carpet by uniformly scattering 25 g of cleaning powder onto the surface and then working it in by brushing.
• the brush used was a medium-hard brush with polypropylene bristles with which the surface was uniformly brushed for about 25 seconds with vigorous strokes from various directions. After drying, which took about 4 hours, the pieces of carpet were thoroughly vacuum-cleaned until no visible powder residues remained on the carpet.
• the results obtained were evaluated using a Dr. Lange Micro Color color difference measuring instrument on the basis of the CIELAB method (DIN 6074).
• the three-dimensional color representation in the form of the L*, a* and b* diagram is used, the lightness (L*)--also known as the grey value--being situated on the vertical axis of the three-dimensional color body.
• the cleaning results of the individual formulations are expressed as the number of units by which the value L* was found to be lighter or darker than in the case of cleaning with the formulation A used as standard.
• Resoiling behavior was tested by initially subjecting pieces of carpet measuring 40 ⁇ 79 cm. which consisted of the same material as described above, to the cleaning process described above and then treating them with the test soil in the manner described above. The results were visually evaluated by comparison with pieces of carpet which had been treated with the standard cleaning formulation. The following evaluation scale was used:
• composition of the individual formulations used for the tests is shown in % by weight in Tables 1 to 3 below, the figures relating to active substance.
• the results reflect the outstanding effectiveness of formulations 1 to 15 according to the invention.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Emergency Medicine (AREA)
• Molecular Biology (AREA)
• Inorganic Chemistry (AREA)
• Detergent Compositions (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)

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• 1994
  • 1994-06-22 DE DE4421784A patent/DE4421784A1/de not_active Withdrawn
• 1995
  • 1995-06-13 EP EP95924222A patent/EP0766725B1/de not_active Expired - Lifetime
  • 1995-06-13 DK DK95924222T patent/DK0766725T3/da active
  • 1995-06-13 US US08/765,859 patent/US5746777A/en not_active Expired - Fee Related
  • 1995-06-13 AT AT95924222T patent/ATE170549T1/de not_active IP Right Cessation
  • 1995-06-13 WO PCT/EP1995/002288 patent/WO1995035358A1/de active IP Right Grant
  • 1995-06-13 DE DE59503446T patent/DE59503446D1/de not_active Expired - Fee Related

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